<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8" />
		<title>Document</title>
	</head>
	<body>
		<script type="text/javascript" >
			async function demo(){
				const r1 = 900
				console.log(r1)
			}
			demo()
		</script>
	</body>
</html>